from the senate is although we were inviting to come in and initial stage voluntarily and only subpoena them as necessary, all of our interviews are under oath. so when we ask the witnesses as we often do, have you produced all of the documents that were requested of you, all the documents relevant to this investigation, those answers are under oath. so we often will ask witnesses, and i can't commend on the specific questions that may have asked here, but we often ask them what e-mail addresses did you use, what text platforms did you use? did you use encrypted applications. of course we'll review our information to see what his testimony was. but also, we'll want to follow-up to make sure that that document production was complete. >> representatives of twitter met with investigators from your community today. the company has admitted that fake twitter accounts linked to russia helped spread fake news during the campaign. what more did you or your staffers learn about how this was exploited and what can be